I just went through the same problem last month. I could not get the usb Proprietary plug to stay in the unit. It would just fall out. pressed it in as hard as I could to no avail. Needless to say it...

Been charging for over 48 hrs. Tried both usb and Gomatic 1A charger that plugs into proprietary plug. Usb will only charge to 93%, Gomatic only 87%.
Updated firmware 2.0.45. Tried transfering files...